Active Stabilization of Compressor Instability and Surge in a Working Engine

[+] Author and Article Information
J. E. Ffowcs Williams

Department of Engineering, University of Cambridge, Cambridge, United Kingdom

M. F. L. Harper, D. J. Allwright

Topexpress Limited, Cambridge, United Kingdom

J. Turbomach 115(1), 68-75 (Jan 01, 1993) (8 pages) doi:10.1115/1.2929219 History: Received February 04, 1992; Online June 09, 2008


We have applied feedback control to the compressor of a 45 kW auxiliary power unit. Using this, the engine is able to deliver more than 10 percent extra shaft power before surge occurs. We achieve control by suppressing a nonaxisymmetric flow phenomenon in the diffuser of the centrifugal compressor. Control is effected by modulating a small extra airflow into the impeller. We present results of modeling and analysis suggesting that linear feedback control will be sufficient to stabilize a compression system, even when both axisymmetric surge and rotating stall are present as possible instabilities.

Copyright © 1993 by The American Society of Mechanical Engineers
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